Fortnite is known for hosting big events from time to time, and that tradition continued today. In what was one of the highlights for season 9, a monster (Doggus) and robot (Cattus) battled across the map.

Fortnite seems to have its next major crossover. Earlier today, players began to notice portals from Stranger Things in the game. Step inside and you’ll teleport to another portal that’s close by.

It’s unclear what the extent of the crossover will be. Will things stop at the portals? Or will another element be added? Perhaps there could be more to this, as the third season of Stranger Things goes live on Netflix tomorrow.

Had history gone another way, things could have gone very differently with Fortnite. Rod Fergusson, the former director of production at Epic Games, told Game Informer in a recent interview that he tried to cancel the game.

Fergusson referred to how Fortnite “had some challenges” when it was only comprised of Save the World. “As the director of production at the time, that game would not have passed my bar for something we should have continued to keep going,” he said.